The shape overlap between the reference and the fit molecule is visualized
by using a property map (OE2DPropMap), i.e., a 2D grid,
laid underneath the molecule structure, where the cells of the grid that
are colored brown indicate good 3D shape overlap between the reference and
the fit molecules.
Additionally, clashes between the molecular graph of the fit molecule and
2D molecule surface of the reference structure imply shape mismatch in 3D.

Example of using the OERenderShapeOverlap function

(A) reference molecule (shape query)

(B) fit molecule

shape query depicted by the OERenderShapeQuery function

shape overlap depicted by the OERenderShapeOverlap function

Warning

When calling the OERenderShapeOverlap function
no overlay is performed to maximize the color overlap between the
reference and the fit molecule, i.e., the function simply calculates
the shape overlap using the given 3D coordinates.